The number of books borrowed from a library each week follows a normal distribution. when a sample is taken for several weeks, the mean is found to be 190 and the standard deviation is 30. there is a % chance that more than 250 books were borrowed in a week. ©

2.28%

Step-by-step explanation:

Let X be the  number of books borrowed from a library each week

Given that X is normal with mean = 190 and std dev = 30

Thus Z score would be

Z=

Required probability or chance = P(X>250)

=P(

=P(Z>2)

=0.5-0.4772

=0.0228

=2.28%

step-by-step explanation:

mean or average is 40.6

47 - 90 = 43

43 - 180 = x

x = 137